6533b7d1fe1ef96bd125c353

RESEARCH PRODUCT

Luminescent silicon nanocrystals produced by near-infrared nanosecond pulsed laser ablation in water

Lavinia VaccaroLuisa SciortinoSimonpietro AgnelloMarco CannasGianpiero BuscarinoFabrizio Messina

subject

Materials scienceSiliconCore–shellmedicine.medical_treatmentOxideAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_elementNanoparticleSpectral lineAtomic force microscopychemistry.chemical_compoundmedicineSi nanocrystalLaser ablationLaser ablation;Si nanocrystal;Silica;Core–shell;Time-resolved luminescence;Atomic force microscopy;Micro-Raman;IR absorptionNear-infrared spectroscopyTime-resolved luminescenceSilicaSurfaces and InterfacesGeneral ChemistryCondensed Matter PhysicsAblationLaser ablationSurfaces Coatings and FilmsMicro-RamanchemistryLuminescenceIR absorption

description

Abstract We report the investigation of luminescent nanoparticles produced by ns pulsed Nd:YAG laser ablation of silicon in water. Combined characterization by AFM and IR techniques proves that these nanoparticles have a mean size of ∼3 nm and a core–shell structure consisting of a Si-nanocrystal surrounded by an oxide layer. Time resolved luminescence spectra evidence visible and UV emissions; a band around 1.9 eV originates from Si-nanocrystals, while two bands centered at 2.7 eV and 4.4 eV are associated with oxygen deficient centers in the SiO 2 shell.

yearjournalcountryeditionlanguage
2014-05-30
10.1016/j.apsusc.2014.01.041http://hdl.handle.net/10447/96050